Voltammetric detection of synthetic water-soluble phenolic antioxidants using carbon nanotube based electrodes

Ziyatdinova, Guzel; Gainetdinova, A. A.; Morozov, Mikhail; Budnikov, H. C.; Grazhulene, S. S.; Редькин, А. Н.

doi:10.1007/s10008-011-1295-x

Cited by 39 publications

(17 citation statements)

References 25 publications

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“…The number of oxygenated groups located on the tube ends and walls affect the electron transfer rate. The decrease in the overpotential for each analyte indicates an increased electron transfer rate in the oxidation reaction, which agrees well with literature data for phenolic compounds [35].…”

Section: Electrooxidation Of Lipophilic Vitaminssupporting

confidence: 80%

MWNT-modified electrodes for voltammetric determination of lipophilic vitamins

Ziyatdinova

Morozov

Budnikov

2011

J Solid State Electrochem

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Multi-walled carbon nanotube modified graphite electrodes (MWNT-GEs) have been created for the voltammetric determination of α-tocopherol and retinol. The electrode surface was characterized by atomic force microscopy. The MWNT-GEs presented structured surfaces and a significant (26-fold) increase in roughness over unmodified graphite electrodes (8.2 vs. 0.32 nm for MWNT-GEs and GEs, respectively). Their surfaces consisted of aggregates with a highly regular "thorn-like" structure. α-Tocopherol and retinol were oxidized on the bare GEs and the MWNT-GEs in 0.1 M HClO 4 in acetonitrile. Decreases in the overpotential of 0.2 and 0.04 V for α-tocopherol and retinol, respectively, and increased oxidation currents were observed on the MWNT-GEs in comparison with the unmodified electrodes. The calibration graphs were linear in the range 0.065-2.00 mM for α-tocopherol and 0.05-1.50 mM for retinol. The detection limits were found to be 0.05 and 0.04 mM for α-tocopherol and retinol, respectively. The developed electrodes were applied to determine α-tocopherol and retinol in pharmaceuticals. The results obtained agreed well with coulometric titration data.

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Section: Electrooxidation Of Lipophilic Vitaminssupporting

confidence: 80%

MWNT-modified electrodes for voltammetric determination of lipophilic vitamins

Ziyatdinova

Morozov

Budnikov

2011

J Solid State Electrochem

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“…Electrodes chemically modified can be an advantage because the electrocatalytic activity of a variety of modifiers (carbon nanotubes, porphyrins, phthalocyanines, etc.) can reduce the oxidation potential while increasing the intensity of the electrochemical response [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Advantages of the Biomimetic Nanostructured Films as an Immobilization Method vs. the Carbon Paste Classical Method

et al. 2012

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Tyrosinase-based biosensors containing a phthalocyanine as electron mediator have been prepared by two different methods. In the first approach, the enzyme and the electron mediator have been immobilized in carbon paste electrodes. In the second method, they have been introduced in an arachidic acid Langmuir-Blodgett nanostructured film that provides a biomimetic environment. The sensing properties of non-nanostructured and nanostructured biosensors towards catechol, catechin and phenol have been analyzed and compared. The enzyme retains the biocatalytic properties in both matrixes. However, the nanostructured biomimetic films show higher values of maximum reaction rates and lowest apparent Michaelis-Menten constants. In both types of sensors, the sensitivity follows the decreasing order catechol > catechin > phenol. The detection limits observed are in the range of 1.8-5.4 μM for Langmuir-Blodgett biosensors and 8.19-8.57 μM for carbon paste biosensors. In summary, it has been demonstrated that the Langmuir-Blodgett films provide a biomimetic environment and nanostructured biosensors show better performances in terms of kinetic, detection limit and stability. OPEN ACCESSCatalysts 2012, 2 518

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“…[1][2][3][4] The microextrations and electrochemical catalytic oxidation of pyrogallol on an 8-hydroxy-quinoline aluminum complex modied carbon paste electrode has been investigated previously by our group. [1][2][3][4] The microextrations and electrochemical catalytic oxidation of pyrogallol on an 8-hydroxy-quinoline aluminum complex modied carbon paste electrode has been investigated previously by our group.…”

Section: Introductionmentioning

confidence: 99%

A quantum chemical study on the electrochemical behaviour and solid phase microextraction of pyrogallol at an aluminum-8-hydroxylquinonoline modified carbon paste electrode

et al. 2015

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Quantum chemistry calculations were performed with PM6 in MOPAC2012 software based on the molecular cluster models of a piece of graphene including 38 carbon atoms, 8-hydroxylquinolinealuminum complexes and pyrogallol in vacuum conditions. The calculation results show that all the molecular cluster models are thermodynamically stable with negative reaction free energy changes. The frontier orbital analysis shows an electron transfer induced electrochemical catalytic mechanism. The descriptor of an exchangeable electron well describes the catalytic behavior of pyrogallol at the modified CPE with a 55.7% oxidation peak current and a linear relationship between the calculated frontier orbital energies and oxidation peak potentials.

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Voltammetric detection of synthetic water-soluble phenolic antioxidants using carbon nanotube based electrodes

Cited by 39 publications

References 25 publications

MWNT-modified electrodes for voltammetric determination of lipophilic vitamins

MWNT-modified electrodes for voltammetric determination of lipophilic vitamins

Advantages of the Biomimetic Nanostructured Films as an Immobilization Method vs. the Carbon Paste Classical Method

A quantum chemical study on the electrochemical behaviour and solid phase microextraction of pyrogallol at an aluminum-8-hydroxylquinonoline modified carbon paste electrode

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